Earlier quoted context omitted.
The picture he posted is so obviously and visibly a slice of chorizo that it really is no more than a good joke, nothing smug about it. IMHO, it does demonstrate his point very well if some people took his statement that it was Proxima Centauri at face value simply because he is an expert.
It is not "obviously and visibly a slice of chorizo" to me ... google pictures of venus and it's not clear that this photo is in any way clearly a fake to a lay person.
Anyway, it's odd that people would argue on this instead of just laughing it off as "well played", but people argue over everything these days...